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One litre of sample of hard water contai...

One litre of sample of hard water contain `4.44mg CaCI_2 and 1.9mg` of `MgCI_2`. What is the total hardness in terms of ppm of `CaCO_3` ?

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The correct Answer is:
6
4.44 mg `CaCl_2` is equivalent to 4 mg `CaCO_3`
1.9 mg `MgCl_2` is equivalent to 2 mg `CaCO_3`
Total wt. of `CaCO_3=6` mg
Hardness in ppm =`(6xx10^(-3))/10^3 xx10^6=6` ppm
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